Hi Lea,
welcome to the TYPO3 community! I try to answer your questions:
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Of course there are differences between major TYPO3 versions like 11, 12 or 13. But everything that was written for TYPO3 11 should be also valid for TYPO3 12. Since you wrote that you’re less into development v13 tutorials won’t suit you much.
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There is a TYPO3 Guidebook available as printed book or eBook. Although it was written for TYPO3 v10 it is still valid and should give you a compact overview about the TYPO3 community, it’s ecosystem and basic concepts of TYPO3.
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The podcasts are a great way to getting know more about the TYPO3 project in general because they are less technical. Specifically I’d recommend the episode with Patrick Gaumond. Maybe you know him already since he is also from Quebec. You can find him also on Linkedin.
If you want to get in touch more with the community, I’d suggest to join TYPO3 Slack. You need a my.typo3.org account to get an invite to Slack.
I hope this helps a little bit. Feel free to come back and ask more questions!
Have fun with TYPO3 and our great community!
Cheers
Peter